Hit the national parks over the weekend. Got back in the vehicle after lunch and NO AIR coming through the vents.
First port was to check the fuses (both in car #7 #31) and under bonnet. No issues.
Pulled the blower out and connected it to the battery directly (I ran an inline 30A fuse just incase something went pear shaped). The blower works fine.
Tested the power lead to the blower- has 12V.
Plugged the blower back in and still no power to it.
I read on another thread that If the blower works on 'high', then its probably the resistor. Apparently the resistor is used to select the lower fan speeds, but once you're on 'high' it bypasses it. Mine didn't work at all, so I eliminated a resistor problem. (of course I found this information after I had pulled it out and inspected it and realized I had no idea how to fix it!)

There are 2 what I presume to be relays next to the blower. I can hear the relays ticking over when I turn the air con power on/off, so I presume they are working. I did pull them out and visually inspect them for damage/melting etc. The one closest to the front has a brown/red power cable to it. I hooked up the multimeter to this and I got 12V without the blower connected, but current dropped to 5-6V under load (ie: with the blower plugged in)-So I presume there is an earth leak somewhere.
Following some advice found on another thread, I checked out the dash fuse panel. Other people have found that the fuses or circuit board have corroded or the solder has cracked causing an earth leak inside the fuse block.
Checked fuse #7 with and without load (blower plugged in and unplugged). No change to voltage. So this leads me to think there is an earth leak between fuse #7 and the blower. I didn't have time to pull the fuse block apart (although I did pull the back off it, found some unrelated damage and then decided I was only going to damage something else if I continued- will replace the fuse block once it starts to die) , So decided I would bypass the leakage in the fuse panel by cutting the power cables and adding an inline fuse to connect them together. Again, found this idea in another thread.

I pulled the fuse block out from under the dash. Its a pain to pull out because the leads on the back aren't long enough to pull the whole thing comfortably out with the plugs connected.
I found prying them out with the help of a screw driver made it quicker. I also numbered the plugs on the back for reference (I think there are 8 in total).

I worked out which plug harness goes to fuse #7 and fuse #31. NB: Fuse 7 is for power coming INTO the fuse block. Fuse 31 is for power going OUT of the fuse block to the blower.
I checked the power lead coming from the battery to the back of the fuse panel ( its a small brown plug at the bottom of the fuse block-3 wires. Plugs in horizontally). The Brown/pink wire is the power and runs to fuse #7. No power issues.
Took me a while to find the plug harness for fuse #31. If you're looking at the front of the fuse panel, its on the left hand side at the back running vertically. There are 3? plugs-its the middle plug harness. I unplugged the harness and ran power from the battery to the plug (connected to the Brown/red wire). I hooked up the multimeter to the brown/red wire going into the relay next to the blower (relay closest to the front) and got power. This confirmed that I had the right lead.

Once I double check I had the right cables (I didn't want to cut something random), I cut the cables and joined them using an inline 30A fuse and insulated spade connectors. Plugged it all back together and all was working! (NB: I left about 2 inch of cable on the plug incase I want to rejoin the wire later down the track)
Ill try to find links to the other threats I used and add them later.

Took me 6 hrs over three days to sort this (in between family/work commitments/pulling the car apart and putting it back together each time). Had I done it all at once, probably would have taken a few hrs. NB: I don't have the best knowledge of vehicles/electronic-so apologies for any poor phrasing.
Hopefully this will make it easier for someone down the track to fix theirs.

below are some of the threads used
http://www.aulro.com/afvb/discovery-...lower-fan.html


http://landroverforums.com/forum/discovery-ii-18/heater-fan-problems-19235/